Who is the author of the Periodic Table?
When was the Periodic Table created?
Which element is the most abundant in the Universe?
Which element is the lightest of all the elements?
- Which element has the largest number of compounds?
- Which element is the rarest elements in the world?
- Which element is the third most abundant element in the universe?
- Where oxygen can be found?
- How many elements are in the P.T. nowadays?
Scientists from which countries have opened these elements (113, 115, 117 and 118)?
Element Crossword Puzzles
Easy Symbols
| Down 1. This element’s chemical symbol is Li 4. This element’s chemical symbol is Ne 5. This element’s chemical symbol is Al 7. This element’s chemical symbol is Ar 8.This element’s chemical symbol is O Across 2. This element’s chemical symbol is He 3. This element’s chemical symbol is N 6. This element’s chemical symbol is C 9. This element’s chemical symbol is I 10. This element’s chemical symbol is U |
- Strange Symbols
| Across 1.This element’s chemical symbol is Na 3.This element’s chemical symbol is Sb 5.This element’s chemical symbol is Sn 6.This element’s chemical symbol is Au 8.This element’s chemical symbol is K 9.This element’s chemical symbol is Pb Down 2.This element’s chemical symbol is Fe 4.This element’s chemical symbol is W 7.This element’s chemical symbol is Ag | 
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It’s a Gas!
| Across 2.This gas can be used to fi ll party balloons. 4.This gas is used to make yellow-green ‘neon’ signs. 6.This gas is widely used in luminous signs. 7.Nearly 1% of the earth’s atmosphere is... 9.About 21% of the earth’s atmosphere is... 10.Most of the visible universe is made of... 11.This gas is used in strobe lights Down 1.When combined with tin, this gas helps keep your teeth strong. 3.This gas helps keep swimming pools clean. 5.About 78% of the earth’s atmosphere is... 8. A radioactive gas. | 
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Read the text and answer the questions.
Metals and non-metals
Engineering materials can be divided into:
• metals- examples of metallic materials are iron (Fe) and copper (Cu)
• non-metals- examples of non-metallic materials are carbon (C) and silicon (Si).
As iron is such a widely used material, metals can be divided into:
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• ferrous metals- those that contain iron
• non-ferrous metals- those that do not contain iron.
- Elements, compounds and mixtures
With regard to the chemical composition of materials -the chemicals they contain, and how those chemicals are combined- three main categories can be used:
• Elements are pure materials in their most basic form. They cannot be broken down into different constituents ('ingredients'). Examples of elements widely used in engineering materials are iron, carbon and aluminium (AI).
• Compounds consist of two or more elements that are chemically bound - that is,
combined by a chemical reaction. An everyday example is water, which is a compound of hydrogen (H) and oxygen (0).
• Mixtures consist of two or more elements or compounds which are mixed together, but which are not chemically bound. In engineering, common examples are alloys -that is, metals which have other metals and/or non-metals mixed with them. A common example is steel, which is an iron-carbon alloy, and can include other alloying metals- metals which are added to alloys, in small quantities relative to the main metal. Examples of widely used alloying metals are chromium (Cr), manganese (Mn) and tungsten (W).
· BrE: aluminium ; ArnE: aluminum
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